linux-kernel - Re: linux-next: manual merge of the vfs tree with the parisc-hd tree

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Message-ID: <20200513150221.GQ11244@42.do-not-panic.com>
Date:   Wed, 13 May 2020 15:02:21 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Al Viro <viro@...IV.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Xiaoming Ni <nixiaoming@...wei.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Helge Deller <deller@....de>,
        Parisc List <linux-parisc@...r.kernel.org>, yzaikin@...gle.com,
        linux-fsdevel@...r.kernel.org,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: linux-next: manual merge of the vfs tree with the parisc-hd tree

On Wed, May 13, 2020 at 09:44:40AM -0500, Eric W. Biederman wrote:
> Luis Chamberlain <mcgrof@...nel.org> writes:
> 
> > On Wed, May 13, 2020 at 08:42:30AM -0500, Eric W. Biederman wrote:
> >> Luis Chamberlain <mcgrof@...nel.org> writes:
> >> 
> >> > On Tue, May 12, 2020 at 12:40:55PM -0500, Eric W. Biederman wrote:
> >> >> Luis Chamberlain <mcgrof@...nel.org> writes:
> >> >> 
> >> >> > On Tue, May 12, 2020 at 06:52:35AM -0500, Eric W. Biederman wrote:
> >> >> >> Luis Chamberlain <mcgrof@...nel.org> writes:
> >> >> >> 
> >> >> >> > +static struct ctl_table fs_base_table[] = {
> >> >> >> > +	{
> >> >> >> > +		.procname	= "fs",
> >> >> >> > +		.mode		= 0555,
> >> >> >> > +		.child		= fs_table,
> >> >> >> > +	},
> >> >> >> > +	{ }
> >> >> >> > +};
> >> >> >>   ^^^^^^^^^^^^^^^^^^^^^^^^ You don't need this at all.
> >> >> >> > > +static int __init fs_procsys_init(void)
> >> >> >> > +{
> >> >> >> > +	struct ctl_table_header *hdr;
> >> >> >> > +
> >> >> >> > +	hdr = register_sysctl_table(fs_base_table);
> >> >> >>               ^^^^^^^^^^^^^^^^^^^^^ Please use register_sysctl instead.
> >> >> >> 	AKA
> >> >> >>         hdr = register_sysctl("fs", fs_table);
> >> >> >
> >> >> > Ah, much cleaner thanks!
> >> >> 
> >> >> It is my hope you we can get rid of register_sysctl_table one of these
> >> >> days.  It was the original interface but today it is just a
> >> >> compatibility wrapper.
> >> >> 
> >> >> I unfortunately ran out of steam last time before I finished converting
> >> >> everything over.
> >> >
> >> > Let's give it one more go. I'll start with the fs stuff.
> >> 
> >> Just to be clear moving the tables out of kernel/sysctl.c is a related
> >> but slightly different problem.
> >
> > Sure, but also before we go on this crusade, how about we add a few
> > helpers:
> >
> > register_sysctl_kernel()
> > register_sysctl_vm()
> > register_sysctl_fs()
> > register_sysctl_debug()
> > register_sysctl_dev()
> 
> Hmm.
> 
>   register_sysctl("kernel")
> 
> > That should make it easier to look for these, and shorter. We *know*
> > this is a common path, given the size of the existing table.
> 
> I don't really care but one character shorter doesn't look like it
> really helps.  Not really for grepping and not maintenance as we get a
> bunch of trivial one line implementations.

Alright, let's skip the helpers for now.

  Luis